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<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    </head>
  <!-- <script  type="text/javascript">
        var a=window.prompt('请输入第一个数');
        var b=window.prompt('请输入第二个数');
        var c=window.prompt('请输入运算符');
        if(c==="+"){
            window.alert(a+b);
        }else if(c === "-"){
            window.alert(a-b);
        }else if(c ==="*"){
            window.alert(a*b);
        }else if(c === "/"){
            window.alert(a/b);
        }
    </script>--> 
    <body>
        <div>
            <form method="get" action="test.php">
              <input type="text" name="num1"/>
              <select name='fh'>
                  <option value="+">+</option>
                  <option vlaue="-">-</option>
                  <option vlaue="*">*</option>
                  <option vlaue="/">/</option>
              </select>
              <input type="text" name="num2"/>
              <input type="submit" value="=" />
            </from>
            <input type='text' value=><>
        </div>
    </body>
</html>
